The mode of infection for which of the following organisms is the ingestion of cysticercoid in an infected arthropod or by the direct ingestion of the egg? Autoinfection may also occur
a. D. latum
b. Hymenolepis nana
c. Taenia saginata
d. Taenia solium
B
H. nana occurs as a result of the ingestion of cysticercoid in an infected arthropod or by the di-rect ingestion of the egg. Autoinfection may also occur.
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A bacterium with which metabolism is MOST likely to form a relationship with Syntrophobacter wolinii?
A) acetate oxidation B) ammonia oxidation C) molecular hydrogen oxidation D) propionate catabolism
Which of the following would NOT be a characteristic of the first life forms on Earth, that is, the very first primitive cells?
A. Oxygen was required for the cells to survive. B. A molecule evolved as a way to store genetic information. C. A barrier made of organic molecules separated the "cell" from the environment. D. Chemical reactions evolved as a way for cells to capture energy from the environment.
Answer the following statements true (T) or false (F)
1. You could observe saltatory conduction in a crayfish. 2. The exposed, unmyelinated gaps between glia on myelinated axons are also sites of voltage-gated Na+ channels. 3. Electrical synapses transmit signals using neurotransmitters. 4. A given neurotransmitter can produce either excitatory or inhibitory effects on postsynaptic neurons depending on the specific receptor type it binds.
Human cells contain ___ DNA's
Fill in the blank(s) with the appropriate word(s).